Coimbra B-Portagem Mondego Metro project is part of the mass transit public transport system of Coimbra, Portugal. Dextra has played a significant role by providing Sonitec tubes for pile testing.

Dextra has supplied Sonitec tubes for testing a total of 67 piles ranging from 12 to 19 meters in depth. The tubes have been instrumental in conducting these tests with the Cross-Hole Sonic Logging (CSL) methodology.

The innovative push-fit connection system of Sonitec has greatly reduced labor time during installation. Thanks to this user-friendly system, the contractor has experienced smoother and more efficient pile testing processes. By eliminating the need for additional labor-intensive procedures, the contractor has saved valuable time and resources. It also ensures a secure and reliable connection between piles.

迪拜地铁是在阿拉伯联合酋长国迪拜运营的城市交通铁路系统。目前有两条线路投入运营，即红线和绿线。未来几年还计划增加更多线路。

对于红线的建设，Dextra 于 2005 年至 2010 年间与 JT Metro 的承包商（大林公司 – 鹿岛 – YapiMerkezi）一起参与，为各种包裹和车站提供众多 Dextra 解决方案。

对于车站建设，特别是基础工程（桩和周边 D 形墙），Dextra 提供了其 Bartec 钢筋拼接 解决方案。钢筋连接器用于桩 D 墙、柱和桥墩的垂直连接。钢筋连接器也用于将板重新连接到 D 墙上。总共为该项目供应了 800,000 个 Bartec 钢筋连接器，并由当地 Dextra 售后团队维护的几套 Bartec 设备提供支持。

对于小型维修应用， 维修夹具 还向没有准备螺纹且没有足够的可拼接长度的拼接钢筋提供了耦合器。

对于基础工程也是如此。 Dextra 提供了超过 60 公里的 Sonitec 声波管，使用 CSL 进行桩和墙的完整性测试。由于其推入式嘴系统，Sonitec 可以在现场轻松组装，从而提高团队生产力并避免将管子焊接在一起的繁琐任务。

最后，为了加速隧道掘进阶段并最大限度地减少退出/进入竖井和车站时的 TBM（隧道掘进机）时间，Dextra 设计了 GFRP软眼 并为众多车站包提供了超过 400 公里的复合钢筋。

伦敦横贯铁路（2016年更名为伊丽莎白线）是欧洲最大的工程项目。它是伦敦交通局投资计划的重要组成部分，也是 50 年来对交通系统最大的扩建项目。

该项目包括一条横跨大伦敦、全长118公里的东西向铁路线，西起雷丁和希思罗，东至申菲尔德和阿比伍德。

自 2009 年以来，Dextra 已在 20 多个包裹上提供了超过 600,000 个 Griptec 连接，其中包括：

• 利物浦街
• 帕丁顿
• 邦德街
• 金丝雀码头
• 皇家橡树门户网站
• 布丁厂巷

Griptec 连接器已用于 D-Wall（垂直和水平连接）、柱和桩（垂直连接）。

Crossrail 的部分路段预计将逐步开始运营，预计于 2019 年 12 月全面竣工。

The Rio de Janeiro Line 4 is a subway line. It is part elevated and part underground (2 segments). The line has been planned to open for the 2016 Rio de Janeiro Summer Olympics.

Dextra has been involved since between 2013 and 2015 in the design, engineering and supply of four large FRP Soft Eyes for the station entry/exit points. Those Soft-Eyes were the first ever delivered in the South American continent.

在 D-Wall 施工之前，Dextra 设计 FRP 笼时会考虑 TBM 的尺寸、误差范围、土壤力和更多设计参数。

Thanks to the properties of FRP material, Tunnel Boring Machines cut through the D-Wall in a minimum time, saving time on schedule and ensuring the perfect condition of the TBM’s head. The time factor is especially important in humid environments such as Rio to limit the water entry into the station excavations.

On this project, Dextra also supplied Rolltec Rebar Couplers, used as vertical connections in the station diaphragm walls as vertical connectors to reconnect cages.

Couplers were also used horizontally to provide a reconnection point for slabs (at station level and at the surface) in the D-Walls.

Nagpur, the second capital of Maharashtra and one of the fastest developing city in India is witnessing major growth in terms of Infrastructure. The development encompasses primarily the connectivity, of which Metro rail becomes a major part.

Incepted in 2016, the metro project is being a subject of acclaimed discussion for its speed of execution and the quality of construction.

Within the city boundaries, it requires the highest standards of safety considerations including the seismic analysis of structure in service life.

Project Requirement

The fast track project has typical structure for its Line 1 alignment, where the viaducts are supporting 2 levels of pathways, lower one for NH-7 and upper one for the metro rail. As the impact loading is a big concern due to train movement.
Being the stretch of always busy traffic, a solution was required which does not have to revise the existing design. Plus a major concern was the impact on speed of the otherwise fast moving project. The issue was concerning to all the stakeholders especially the GC for the project, who were looking to maintain the agility as well as find a sustainable solution.

Solution

Dextra Introduced Shear Key Bars for the priority section allowing the structure to neutralize the seismic forces. This not only helped the contractor to get the work done faster, but also enabled the client to go for the trial run earlier than expected.

The Doha Metro is a rapid transportation system, designed as an integral component to the larger Qatar rail network. This country wide mega-scale infrastructural project consists of 300km of rail and 100 stations. The rail network to reduce traffic congestion, and to connect the people of Qatar with the rest of the GCC region. At the city scale, currently under construction, the metro is projected to be operational by the end of 2019. It will serve Doha and its surrounding suburbs with stations located in all major nodes of the metropolis. Doha Metro will be operating both at grade and below grade, with the majority of the metro project being underground. Complex tunneling and soil retaining solutions by Dextra were utilized in the construction of this project.

Glass Fiber Reinforced Polymers (GFRP) as Tie-back anchors to retain soil

To eliminate concerns of encroachment, and obstacle for future construction projects, the Diaphragm Wall (D-Wall) at Al Sadd C-Ring Station were post-tensioned anchored with ASTEC Active Active Anchor. These high performance, fully cut-able GFRP anchors were chosen by ALSYJ JV contractors and the D-Wall anchors of choice. This innovative solution was chosen because it can be cut by Tunnel Boring Machines (TBM) or standard excavation equipment, it also doesn’t need to be removed from the ground even in temporary applications. For Al Sadd C-Ring Station 7,113 strands for GFRP rebars were used to make approximately 700 ground retaining anchors used in the D-WALL around that station.

The Second Ho Chi Minh City Environmental Sanitation Project consists of the construction of interceptor that will convey the wastewater collected from the Nhiêu Lộc-Thị Nghè Canal and District 2 areas of Ho Chi Minh City to the treatment plant.

Dextra has been involved in the construction of the large underground system by supplying 40 Soft-Eyes to assist in the tunnel breakthroughs.

The cuttable Glass Fiber Reinforced Polymer (GFRP) Soft-Eyes were applied to reinforce 21 shafts, allowing the penetration by the Tunnel Boring Machine (TBM) without the need of removing steel reinforcement and without the risk to damage the TBM’s head.

With its completion, planned to be in 2022, the wastewater services in HCMC will have a considerably more sustainable nature, and will be remembered as the first big step toward the alleviation of the environmental and sanitation issues of the Country.